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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56d91fd00b4e469e0a8c8c44f2766d8ad9c620ddf2af8adc5612dc95c5c2d94' 
  AND token = '8jIYN6E5yt0wTrd2QoH2LU/d40PXwBy8fbyhDcEkO38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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