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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083d0c3bbe43e3a8dafb90c5555f76a288ebceb7e4499488e699eca34d0c2417' 
  AND token = 'ZXihuFN4rkuyL7vbCVL/o33lfNiHtiBZoeUIllahsyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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