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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24505ec90ad0b116174f5b35163e413f9522cf15f0d306721f92cdbc8243de00' 
  AND token = 'yUqRZOOkM9v2A8kZKaMc9TwzEcA6V2D/Tq0wCOCBiG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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