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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a261a50efb99d27be123a57e7cc0bfa1db64af8f2323d9ec9d95fb81f02865b' 
  AND token = 'wNsB97O68ONoPXRV8J6Jd0/y8155sOD4AQ9ANuQZEaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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