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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0bc3083f9a98fe60d4460484381b942b2694245bd1f422d72010fae888ad69' 
  AND token = 'KxOVZf/GOpM9W1Uyhl4SX4d/ENyRd+lgN3pT7wcDCRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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