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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b2a96cced1015869beb1729c99ca9d8ccbd29f1c88d7d7e5123689d79b3f1b' 
  AND token = 'WlDs9nNqweZf7K/c59bn73Mz4a1veJ/ldnjHQVE5kX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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