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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d675ba47ad243d6ebcfa9663df351853307384143b456c33e9c8c40309f136' 
  AND token = 'w9/OZqJC6YnIezDbN4unDKvzjjt14lKud+cE7tmzTyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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