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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f9d4ac08c89230b711eb03e6041e2a996d24d5e47fcd170ee99cb3ca43cd73' 
  AND token = '8Y9+m/DX92vYplnU2Bt6Bx9YfIKSzfeZ1ill/bijR28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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