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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e789968479425c8ec79a02ee2efe39d336c0e8203598437d833f6fa63186670c' 
  AND token = 'aCDy7BD8ay/cinZEmf5botVdI3xP2IEf+ineX0sex28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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