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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c998d59dc9e2d5cc4a47a9160fae59e63e7db5a47bf7754c92076a1b7d0211e1' 
  AND token = 'oy8z/S+10wXg+2NA+2rROU/LZmKZXwWRv022VTS0OP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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