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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a8a679b5528236ac71a2a202e5462ef591413bc09e9b69d5381376af01f154' 
  AND token = 'c7ZsrY+UqKm809IbB6D5Xy7N7PVnI9fDVK3kcZnyX8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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