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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd316238349c4bf0371b2bf88db6b279503eebdc4ae74fed7f4cdfda8bf65abf9' 
  AND token = 'udvRyho0uxY+8hfmhTEiCjvRjB5YNdc6P+9FxcHHjaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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