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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00f7e93ec830b666ae1937af8a785b2e017528b4ed38ba1b25ca1cd44cc4ce7' 
  AND token = 'HcBfGn4FwqGYRT322aeJId3HKL+J68Mz/O+aR0sFHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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