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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439bc2d2a299eb1cddcee7ce5f091101a8150c8b0b580b49917c3f5d95ac24f1' 
  AND token = 'pTAnD32MK/wMgxOGyWeEJ8g/RZZKFbQ4/Fm5HtNOAlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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