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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9414cb24d04b7c77acc4bfec39d47f096c50ec403b4cc367cdfb48e2ccd311' 
  AND token = '750q/2jVMSkRhaM6Chf/RCs7l8Sw/WhWI3MN5OmCneA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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