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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5d0785efb905b31a91f513083a542844c5ad55fc6e9d50be0af574512ec1f8' 
  AND token = '7qxfs0+CigENuGUv/BMDV5mhj40k3KbgPZ7gxDh1j7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}