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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3df881376395b8646e39a76430936587624bf1b1096af8a92b4524e0ec1b52c' 
  AND token = 'tI6ga3881fwcbZEKdT40MqanQS6F+2xReFkU6IhwR9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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