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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28022fd192172f9f82db9f975e6447fb1d4a0ffa88e538e8fbfd3052138400e8' 
  AND token = 'dH/wU4vqeYmc1EWiL9mkVH2qC6W9J8tqmgM3ZkUC7W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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