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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43ca90448ee486b03f58c00e0e436f8abd704b42231c14bdf7e781334cc8ba3' 
  AND token = 'KG/LN6jNJg5yTTc00WRC6WQDNqkn2t/1xyYL/4Y2Ek8=' 
  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"
    }
  }
}