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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287ec16924516353581f956e865fa4b83a54788a88042f5aa0899318b4468990' 
  AND token = '5k273Jed4C4hQ1EV1M9jAVRy/JiV1ZEk8rahloKaH6k=' 
  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"
    }
  }
}