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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f9561b58c710d000d3e844a757da9eb6a2074ffefc48ea8b6a5ee95fb95185' 
  AND token = 'AlNYLYj1vEAD6CzN8gk6WznPPx5m7xCQuNwpaBnVtxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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