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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a930e5e853a6bfcbf62cfe4aef1d1818962852a4ef64c04bd965ad8b7b172c' 
  AND token = 'ZdWuxqp9RD6Vddz5O8v5H21prnez5McO4uazTGCOPoE=' 
  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"
    }
  }
}