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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a51521d645cac902bdaed6cd7001f730dd98c51d4bc516b436d60b8603b4ab1' 
  AND token = 'ZQNA7xqOg74BRCbiKoA/uWJ60Ngmobklzaw+7qcbn6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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