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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a178f019d2c2807c3cf68a2e8c1bce5d4ab80ecd5f7a56d5dae0e5cb85e45674' 
  AND token = 'NTRQ7YFD7/mFTsMbQSyzvHpT/Yo+zqAV+isdxzVcZb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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