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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cb5c10b8ed0421ed79dc2a294750ed4f2f78ffb2f4a58dcdaac7462bd85b94' 
  AND token = 'UTUMkfiA+JAkxnt17sNKpVi3I9KW1STaiKnf+2dtta4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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