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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c794cd124f466430f475e6fe022f0db47df04ef62814a860d7c7740adfbc3c65' 
  AND token = 'lfE9e6y8V3p+sGCX297whTd6kpJNvGflA601+rreDIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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