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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee4427965947f49a02a654a89163f0fa6175a14954b9a4e43814491194684e1' 
  AND token = 'PZ6hhiE+dXJtvRhbxi8qYA0bTHCbckugAtjuwHkIfS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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