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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d551b30ad9dcee50ce70148759a57467479ba4914f42b3d620849d006008bb' 
  AND token = 'qPGF3bXZuZJ9Zt7WvYziArCoIAVj73IKv4+US5SPxpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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