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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886971a72fc3e68ceef4290866cb268ee12fc19a4feb31040158639e4db940ad' 
  AND token = 'NdlNxk+Gw7rIohUEt/EKiL8txl6WobUUk6IiTU9VfO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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