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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4525130278a4065cbfa7cfb72b9b1f0ba4815f25e39126d8a34f54f8e10214' 
  AND token = 'pZRAmNdpi4gpMES/W4fX5a0KzbF3wLj8NaiRntgiBZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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