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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae7bee7fdf82b411c836e902fb948e0a292e2f958afd89b98952afb8d496175' 
  AND token = 'Xx/UZW4KqHnjASDRfzRHUTqNxMzSQnp/BtY4F1gss54=' 
  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"
    }
  }
}