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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf20185c4bc80872ec7c7079bfde7bc05a3d4ae193dc761105d325f45fdd2a8' 
  AND token = 'vr5Awea3f59kzgbvQSTNOu3wp21aYIPE8xu5bT2BNM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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