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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0665ff841153f569dabe63a90b6c6d320e60344f3882e347331cbea9f58a4c60' 
  AND token = 'lIxfs0xbD0Gx22IOfFANuqxLKJ+uF8PqmC0z7PwDeBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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