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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffda3da5f24d9207bbfa3c3e3dd2ea63ab979d0678942fb07d3daae85b3469e' 
  AND token = 'bCl0h8VNFk/Hdf7O1vXfBAWxMFmjfL5csc6WTlLjpbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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