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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a4bfa64a5a0ee36340fa814e015d95edd79ea7d3a6b3e66df10eae509c9ad2' 
  AND token = 'V+Ie36eihWaCv/k5SZJD64jReP1Mpoc6mzHPoTlaq40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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