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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c247c587c1a4914920b54c00ed40d23a8292e6b9b7cdf8bfc44599b6ce8bfb' 
  AND token = '4+GVcZ41bz/Kftf43BfaZ6Y11jpsb9F0Kv/4EEX8mPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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