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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1551f533807097553a429388769d514e456c0a82df989e79ea6e0c1236a6b2e3' 
  AND token = 'uyGvo6VHGy0RALhym/FMHAnGSVE5+yS+An+QmA0fF18=' 
  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"
    }
  }
}