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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8468a730b5ba5820d45da10d7f413794bcaa8c16617160aa8cca8fe4077d8993' 
  AND token = 'N5V1629SDNSeBHEuX1ks980LBoXpUlgnwvsevZdgZbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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